Chain pintle



L. H. BOSNIAN Sept. 3, 1935.

CHAIN PINTLE Filed June 17, 1933 Patented Seph 3, 1935 I I t I II I I I 2,012,941 Ff r I CHAIN-PINTLE- I Luther H; Bosnian, Milwaukee, Wis,, assignor; to; ChainBelt Company, Milwaukee, Wis., a corporationofWisconsin' p I I j Application June l'i; 1933; Serial'No.,676,389 y r r 8 Claims; (cue-25.4) This invention relates to power transmitting tures; and-the primary object of the present inand conveyor sprocket chains of the pintle-convention isto providea pin construction which to neoted type,-and has for one of its objectsto ima large extent eliminates this diificulty; i prove the construction of the chain pintles where- With the above and other objects in View, which: 1 p

bythe assembly of'the individual links into a will appearasthe description proceeds, 'theinf complete chain may be greatly facilitated. venticn consists in the novel details of construc- One well'kn'own form of sprocketchain speticn and combinationsofparts more fullyhe'recially designed forand widely used in high speed inaL fter describedand particularlypointed 'out in Oil field Work, is made upof fabricated links each the'appended c'laims. V I I t 21: I 10 of which comprises a pair oi'spaced steel-side bars -R er ngtot e acc p y g d g f m 10 1 rigidly connected together at oneiend by a trans ing a part of this specification, in which like ref- Verse thimble orhollow bushing, the ends of erence characters:designatelike partsinallthe which are firmly pressed into aperturesinthe side ,views:- r I j I bars to providesubstantially U-shaped rigidlinks; -Figure 1 isa plan view, part yin S f a j The opposite ends of theside bars are spreadof' i h'Speed sprocket chain suchasabove apart somewhat so that they mayembrace the de c d; p yi g; chain pi11$=c0nSt1iilCfidin7 closed end of the next adjacent link,. and are accordanfiewithfllepresent v apertured for th reception of the connecting i Figure 21 is a side elevationalz view of the parts or pintle, which alsoppasses through the hollow i Figi 1'; V I I I bushing to connect the-two links together. Ow- F u s am a nlar ed-f aem ta y 20 it ing to the high speeds at which these chains opertional views, illustrating the mannervin whichthe, ate, it; is desirable that such: of the assembled present pinconstructionjfacilitates'the proper parts as do notmove relativeto one another he Positioning flf heflats relative to one. another in asrigidly connected as is feasible; andto this I the a y ofthe pinsflndlil'lksland? p 25 end the pintles are ordinarily press-fitted into i u e 1 ape pe vi 'p ni the apertures intheireeends of the side bars, Referringmoreparticularly toithe said drawalthoughthe mid-portions of the pins of course ing in Figs. 1 and Z 'ther'e areillustrated several have a running fit with the interior of the bush links-of a well known-iorm Of h peed sp ings of the adjacentlinks in order that the links chai each of which comp Side b W mayarticulate. At least one of the apertures in and I l=, -provided"at one end with-ap s l 30 the free ends of the side bars-and the correand 3 respectivelyginto which are pressed the spondingportion of the pintle, are previdedwith ends of a tubular bushing M, thus-providing a one or more complementary flats whichiurther rigid substantially U-shaped link. An antifricprevent the pins from turning in the apertures. tion roller I5 may be journalled upon the bush- The pintles may be headed at one end, and locking M, to take the wear from the sprocket" teeth. 35, ing cotters are passedthrough the projecting un- Theopposite ends of-thebars in and H are headed ends, immediately adjacent the side bar}. spread apart :somewhat; so that theymay emand are forced into place under heavy pressure, brace the narrow end. of the next adjacent link, thus insuring against unintentional displacement as'will be readily understood from the drawing,

40- ofthe pintles, even should they become loose in andrsaid' endsaare provided respectively with the 40 I the side bars. I a a r. r Y aperturesflfi an'dalLthe former of which is pref- ,Heretofore, the pins have been of uniform di- ,erably of somewhat; larger. diameter. than the ameter throughout: theirlengtln exceptior a latter., The aperture ll is provided with one or short portion immediatelyv adjacent the head. more flats [8, or other equivalent means, for 00- which was slightly larger in diameter in order operation with a companion means onthe chain 45' that it might have a press fit withthe side bar pintle to preventthe pintle from turningin the aperture, whereas the main body portion of the link, in addition to the resistance to turning; re-

pin would freely slide therethrough. The 'apersulting 'from-thepress fit of portions oi the pine;

ture in the opposite side bar, which was ordinarily tle in the apertures l6 and 11.. v r.

' provided with the flats above mentioned; was of v The pintle 19 comprises a body 20 provided at 50 such. diameter that the'unheaded end of the pin one. end withla head'ZI; immediately adjacent would have'a press fittherein. V j Y I which there is a portion 22 of somewhatlarger a I In assembling these chains, considerable diiiidiameter than the mainfbody 2 0, which mean culty ,hasibeen experienced'in properly locating His-adapted to be forcibly pressed into the aperthe fiat'son'the pins relative to thosein the aper'-' ture" I f the side bar Ill." The body 20'is of such 55 diameter as to provide a running fit within the tubular bushing l4, whereby the links may articulate, and the aperture H in the side bar H is of such diameter as to be a press fit upon the end portion 23 of body 20, which end portion is provided with one or more flats 24 arranged to cooperate with the flat or flats l8 in. aperture IT, as above mentioned.

Beyond the press fit portion 23, the diameter of the body is somewhat'reduced, as at 25, which reduced portion is provided with a flat 26 in alinee ment with the flat'24, as clearly shown in the drawing. The extreme end'of the reduced portion 25'is preferably beveled, as at 21, and that 7 portion of the body which projects beyond the 4 side bar I I when the parts are assembled, is provided with a transverse bore 28 for the reception of a cotter pin 29, which is preferably forced into place under heavy pressure.

in diameter than the, body 20 and press fit portion '23, permits the said portion to freely enter the aperture I! during, assembly, if the flats I8-,.

24 and 26 are in alinement. In'assembling-With the prior'pins, after the apertures 16 and H of one link had been brought into alinement with the bore of bushing M of the next link, when the pin was inserted therein, its unheaded end being of press fit dimension relative to the aperture I], contacted-the upper edge of, the said aperture, and it was extremely diflicult for the workman to determine by sense of touch whether the flats, such as l8 and 24 were in alinement or not. Likewise, thepenetration ofthe pin wassubstantially the same when the flatswere in alinement as when they were not, so that the length. of "the portion of the pin still projecting could not be' relied upon to indicatewhether the flats were in tempting to rotate the pin manually, which rota.

tion willof course be prevented due to the interlocking' of the flats I8and 26.

On the other hand; if the flats I8, 24 :and 26 are not properly alined when the pin is entered, it will move inwardly only to the position shown in Fig. 3, and the workman can tell at .a glance.

from the greater distance between the head 2| and side bar l0 that the .pin is not ready to'be pressed home. Manual rotation of the pin is also possible, since the flats I8.and' 26. are not; interengaged, and suchlrotation should be continued until they do engage, whereupon the pin will freely move to the position shown in Fig. 4, and the operative knows positively that itis'in proper position tohave its press fit portions 22, and 23 forced into the apertures. I6 aud t? of the h of the pins so that the flats I8 and 24 are in properalinement relative .to' one another before the press fit portions of the assembly contact with. one another, and-reliably indicates both visual y sidebar. a V

The invention thus facilitates the positioning and lost through attemptingto press thern' home and by sense of touch when the pins are or are not properly positioned.

It is ohviousfthat those skilled in the art may vary the details of construction as well as the precise arrangement of parts without departing from the spirit of the invention and therefore, itis not wished to be limited to the above disclosure except as may be required by the claims.

What is claimed is:

1. A pin for power transmitting sprocket chains and the like, having a body provided with means arranged to. cooperate with a complementary portion of a link to prevent turning of the. pin in I the link, said body also having a reduced cylindrical extension provided with means in alinement 'with and similar to said first named means and parallel to the pin axis, for facilitating the proper positioning of said complementary means and portion during assembly.

2. A pin for power transmitting sprocket chains and the like, having a body provided with means arranged to co-operate with a companion portion ofa link to prevent turning of. the pin in the link, said body also having a'reduced cylindrical extension provided with a flattened portion parallel to the pin axis and in alinement with said rotation preventing means, for facilitatingthe proper positioning of' said companion means; and portion during assembly. v

3. A pin f or'power transmitting sprocket chains and the like,having a cylindrical body'provided with a flattened portion arranged to co-operate with a companion portion, of a link to prevent turning of thepin in .thelink, said body also having av reduced cylindrical extension provided with a-flattened' portion" in alinem'ent with said first mentioned-flat and'parallel to the pin axis, for'facilitating the proper positioning of said first flattened portion and the companion portion of the link during assembly. 7 n

4. A pin for'power transmitting sprocket chains and the like, having a body provided with portions arranged to be forcibly presse'dinto apertures in a link, at least one of'said portions having a flat adapted taco-operate with a companion fiat in its aperture to prevent turningof the pin in-the' link, said body also having a reduced cylindrical portion adapted to freely pass through said aperture, and, provided with a flat in alinement with'said first named flat and pascal-- lel to the pin a'xisfor facilitating during assembly the proper positioning of said companion.

turning of the pin in the'link, the unheaded'cylindrical end'of' said body beyond one of said press-fit portions being of somewhat reduced diameter to freely pass through its aperture, and

provided withmeans-parallelfto the pin axis and in alinementwith its rotation preventing means, for facilitating during assembly the proper positioning of said co-operating companion means relative to one another prior to engagement of said press fit portions with the apertures into which they areto be forced.

6. A'pin, for power transmitting sprocket chains and the like, having a cylindrical bodyprovided beyond said last named press fit portion, adapted with spaced portions arranged to be forcibly pressed into apertures of the side bars of a link, one of said portions having a fiat arranged to co-operate with a companion fiat in its aperture to prevent turning of the pin in the link, said body also having a reduced cylindrical portion adjacent said press fit portion adapted to freely pass through said side bar aperture, said reduced cylindrical portion also having a fiat in alinement with said first named flat and parallel to the axis of the pin, for facilitating during assembly'the proper positioning of said companion flats relative to one another prior to engagement of said press fit portions with the apertures into which they are to be forced.

, 7 A pin for power transmitting sprocket chains and the like, comprising a cylindrical body provided at one end with a circular head, and an enlarged press fit portion adjacent said head,

adapted to be forcibly pressed into an aperture in one of the link side bars, the other end of said body being adapted to be forcibly press-fitted into an aperture in the other side bar, and having means arranged to co-operate with a portion of said aperture to prevent turning of the pin, said body also having a reduced cylindrical extension to freely pass through said aperture and project beyond said side bar, said extension having means parallel to thepin axis and in alinement with said pin carried rotation preventing means arranged to facilitate during assembly the proper alinement of the rotation preventing means of said last, named press-fit portion and aperture.

8. The combination with'a chain link having spaced side bars, one of which is provided with a pin-receiving aperture having a flat, of a pin including a body having a portion provided with a companion flat arranged to be forcibly fitted into said side bar aperture, said flats preventing rotation of the pin; said body also having a reduced, cylindrical extension beyond said forcefit portion, also provided with a flat in alinement with the flat of said force-fit portion, and parallel with the pin axis, said extension being adapted to freely pass'through said aperture when said pin and aperture flats are alined, and when misalined to engagewith an edge of the aperture fiat, thereby maintaining the pin in a projecting position which indicates such mis-alinement.

LUTHER H. BOSNIAN; 

